Has anyone used this stuff on any of your leak repairs. It is called Flex Seal. Here is a description that they have " Flex Seal is a rubberized leak sealer that seeps into cracks and holes to seal out air and moisture. When dry, Flex Seal, as seen on TV, is a long-lasting, watertight, paintable, flexible rubber coating that wont sag, drip, crack or peel. It seals out water and lasts for years. One can treats 2 12 square feet. Once dry Flex Seal can be painted any color. Flex Seal the easy way to coat, seal and protect. No need for prepping, works wet or dry. Use Flex Seal the liquid rubber sealant coating on roof leaks, gutters, skylights, hoses, windowsills, PVC pipes, flashings, duct work, foundations, basements, chimneys, downspouts, Vent pipes, A/C drip pans, RVs and Campers, Trailers and so much more!"